Q.) How does Immunity work?A.) Simply. A spirit with Immunity: X can be targeted by an X color spell, but the spells will fail to affect the Immune spirit, this includes global effects. Immunity CAN affect the player, but Immune spirits are unaffected and CANNOT be targeted by the effect. Effects that happen when a spirit is defeated, even if it is an Immunity spirit, still happen because the effect doesn’t affect the Immune spirit. Effects that target an attacking spirit, have no interaction with immunity because they don’t affect the immune spirit.

Doulbe target the "Brave" not the "Brave spirit" so i think that the brave is destroy though the "Brave Spirit" has Immunity Red.

Let's Show this in point form:1, Double Blaster sure did mention it target the Brave on the Brave spirit.2, Brave is treated as a part of spirit.3, [Don't get messed up right here] Double Blaster's main target is indeed the Brave on the Brave Spirit. 4, But the target still is through that Brave Spirit.

A ball in a Sealed Box. You want to get the Ball. But the Box is sealed. You can't get the ball out unless you have to open the seal on the box.